10 Ways To Fill The Void Under Your Bathtub

Have you ever looked under your bathtub and felt a little…void? It’s ok, we won’t tell anyone. But if you’re looking for the place to learn how to fill void under bathtub, then read on!

We’ve collected 10 ways to fill the space under your bathtub. Some are simple and easy, others are a bit more involved. But all of them will make that little spot underneath your tub feel a little more finished. So take a look, choose your favorite, and get to work!

How to Fill Void Under Bathtub

Below are the 10 most effective ways to fill the void under your bathtub. Let’s check them out!

Choosing an Appropriate Filler

Before you can fix the hole under your bathtub, you first need to fill it with something. But what?

The good news is that there are plenty of options, and the choice largely depends on what you’re looking for in a filler. For example, if you want something that’s easy to install and doesn’t require much upkeep, then a foam filler might be a good option. If you’re looking for something that will add structural support to the area, then a concrete patch might be a better choice.

Take some time to think about what you want in a filler, and then research the different options to see which one is best for your needs.

Install Rigid Foam Insulation

In order to fill the void under your bathtub, you’re going to need to install some rigid foam insulation. This can be done fairly easily and doesn’t require any major construction skills.

The insulation will help keep your bathroom warm in the winter and cool in the summer, which is a big plus. Plus, it will help reduce noise from upstairs, which can be a real annoyance if you’re trying to take a bath or relax in the tub. It’s a very effective way on how to fill void under bathtub.

Fill the Void With Concrete

You could always fill the void with concrete. This is the most permanent option and it’s a little more work, but you’ll be done once it’s done. You’ll need to create a form to pour the concrete in and then let it set. Make sure to use a level so that your bathtub is nice and even.

Create an Access Panel

Access panels are a great way to fill the void underneath your bathtub. An access panel gives you easy access to any leaks or other plumbing issues without having to remove your entire tub.

You can easily install an access panel yourself using the right tools and materials. First, you’ll need to measure and cut a hole in the wall, then use a hammer and nails to secure it in place. Next, you’ll need to purchase some paneling that matches your decor, then use screws and/or glue to attach it over the opening. Finally, you’ll want to add a latch so that you can easily open and close the panel.

Access panels are also pretty inexpensive, so if you’re on a tight budget this is definitely an option worth considering. Plus, they’re easy to install and will help maintain the structural integrity of your bathtub for years to come!

Use Caulk and Foam Strips to Seal the Bathtub

Caulk and foam strips are a great choice if you want to fill the void underneath your bathtub with a durable, long-lasting material. The caulk will form a waterproof seal over the joint between the tub and the floor, while foam strips are often made of rubber or foam, providing additional insulation.

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To use caulking and foam strips, first make sure that your bathtub is clean and dry. If there’s still any moisture, it’ll ruin the adhesive on the sealant. Once you’ve prepped the surface, measure out a length of calking tape that is slightly longer than necessary to cover the entire gap under your bathtub. Cut off two strips of foam that cover the length of the gap as well.

Using an applicator gun or caulk gun, apply a generous amount of adhesive in a circular motion from end to end along both sides of the gap while pressing down firmly on each side and working outwards from one end of the gap to the other. Then, place one strip of foam board on either side and press firmly into place to adhere it to your adhesive base before repeating this process for any remaining gaps. One of the straightforward ways on how to fill void under bathtub.

Install a Retaining Wall

Installing a retaining wall can be one of the best ways to fill the void under your bathtub. For starters, it’s going to last a long time and won’t require much maintenance. Plus, you can customize it with different colors and designs so that it fits in with the overall look of your bathroom.

Retaining walls are most commonly made from brick, block, or poured concrete and are designed to keep soil from sliding or eroding away. They’re sturdy and durable enough to bear weight, making them perfect for a space that’s going to have a heavy bathtub sitting on top of it. With the right tools and some know-how, you can build one yourself in just a few hours. But if that sounds like too much work you can always hire someone to do it for you.

Add a Liner for the Tub Underneath

Adding a liner for your bathtub underbelly is an easy and efficient solution for filling the void beneath your tub. Not only does it help protect your foundation walls against moisture, but it also insulates against heat loss, helping to keep your bathroom warm in the winter.

Plus, adding a liner is cheaper and easier than having to build out and frame the space before insulating and drywalling. And depending on what kind of liner you choose, you can customize it to match any existing room style you have.

The best type of liners are made from marine-grade vinyl, which is waterproof and extra durable – which makes it perfect for withstanding the moisture that comes with tubs. And luckily, these liners don’t require any gluing or taping during installation either. They just snap right into place!

Create a Vanity With Shelving

Are you the type of person that likes having the full spa experience? Then why not create a vanity space underneath your bathtub with shelving?

You can choose to go all out and install proper vanity cabinets under your bathtub. Like drawers for storage, a sink for washing up, plus open shelves for a little bit of organized beauty. Think about it. You’ll be able to store all your shower essentials in one spot, making it easy to access them while still maintaining the look of an elegant and spacious bathroom.

When it comes to materials, you’ll want to stick with wood or metal because they can stand up against dampness and humidity much better than other materials. And if you’re wondering about installation, there are prefabricated shelves that are relatively easy to install. Or if you have more advanced DIY skills, you could always make them yourself! Another impassive way on how to fill void under bathtub.

Line the Void With Fabric

If you’re looking for a creative way to fill the gap between the bathtub and the wall, line it with fabric! You can choose a pattern or color that matches your bathroom décor or pick something that stands out.

This method is really easy and will only take you a few minutes to DIY. All you need is some fabric in your chosen print, some pins to secure it in place, and scissors to cut it down to size. Simply pin the fabric along the sides of the void, making sure there aren’t any gaps. Then, use scissors to create a neat edge along the top of your design and you’re done!

When done correctly, this simple trick will instantly make your bathtub look more luxurious and sophisticated. Plus, if you ever decide to change up the look of your bathroom down the line, it’s easy enough to unpin the fabric and replace it with something new.

Use Cement Board to Fill and Reinforce the Void

Are you looking for a more permanent solution? If so, cement board could be your answer. This is a great choice if you are looking to fill and reinforce the void without having to replace or install new drywall.

Cement board is usually made of cement, sand, water and fibers with a layer of fiberglass mesh on one side. It’s incredibly strong, fire resistant and water resistant, making it the perfect material for reinforcing the void.

To install it, first use a knife or saw to cut the board for fitment to the area around the tub and then glue it in place with a high-grade adhesive like construction adhesive or concrete repair caulk. Once that’s done, apply some sealant around all edges for extra protection. Finally, apply some tape along all seams created by the cutting process and then apply some joint compound to fill any gaps. The method is very effective and it will help fill up the great stuff foam under bathtub.


So there you have it, 10 ways to fill the void under your bathtub. Hopefully, this has given you some ideas on how to deal with that pesky problem. Hope you now know how to fill void under bathtub. If you have any other ideas, be sure to let us know in the comments!

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